Munshi, D;
Namikawa, T;
Kitching, TD;
McEwen, JD;
Bouchet, FR;
(2020)
Weak lensing skew-spectrum.
Monthly Notices of the Royal Astronomical Society
, 498
(4)
pp. 6057-6068.
10.1093/mnras/staa2769.
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Abstract
We introduce the skew-spectrum statistic for weak lensing convergence κ maps and test it against state-of-the-art high-resolution all-sky numerical simulations. We perform the analysis as a function of source redshift and smoothing angular scale for individual tomographic bins. We also analyse the cross-correlation between different tomographic bins. We compare the numerical results to fitting-functions used to model the bispectrum of the underlying density field as a function of redshift and scale. We derive a closed form expression for the skew-spectrum for gravity-induced secondary non-Gaussianity. We also compute the skew-spectrum for the projected κ inferred from cosmic microwave background (CMB) studies. As opposed to the low redshift case, we find the post-Born corrections to be important in the modelling of the skew-spectrum for such studies. We show how the presence of a mask and noise can be incorporated in the estimation of a skew-spectrum.
Type: | Article |
---|---|
Title: | Weak lensing skew-spectrum |
Open access status: | An open access version is available from UCL Discovery |
DOI: | 10.1093/mnras/staa2769 |
Publisher version: | https://doi.org/10.1093/mnras/staa2769 |
Language: | English |
Additional information: | This version is the version of record. For information on re-use, please refer to the publisher's terms and conditions. |
Keywords: | Cosmology, Weak Lensing, Methods: analytical, statistical, numerical |
UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics |
URI: | https://discovery.ucl.ac.uk/id/eprint/10113450 |
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